<div dir="ltr"><div>Many thanks for the offers - I might still need some help but I've borrowed a preheat hotplate from work and got some new flux and had my first success putting down a lfqp64 10x10 processor (0.5mm pitch) with said hotplate running up to 120c (checked by a sensor stuck to the PCB) and a hot air gun with very low air flow but at 370C.</div><div>Next test is a microUSB connector with solder paste rather than tinning and flux - should be fun ;)</div><div><br></div><div>I've ploughed on knowing that if I don't try (and get at least one winner) then I'll be forever bugging other people at odd times.</div><div><br></div><div>Note to self - when redoing the PCB, put at least one LED on a GPIO to flash when it's running.😁</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 20, 2024 at 9:08 AM Tim Buchanan <<a href="mailto:clairinshkiwi@gmail.com">clairinshkiwi@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Robin,</div><div><br></div><div>I can help you out with this if you still need. Flick me an email to <a href="mailto:clairinshkiwi@gmail.com" target="_blank">clairinshkiwi@gmail.com</a>.</div><div><br></div><div>Cheers,</div><div>Tim<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 19, 2024 at 11:30 AM Robin Gilks <<a href="mailto:gb7ipd@gmail.com" target="_blank">gb7ipd@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Is there someone available over the next few days with the skills to solder a LQFP64 STM32F303RCT6 chip to a PCB ? (I've actually 2 PCBs I want to populate to continue my weather station prototype development). I've managed to cook 2 CPUs now (possibly 3) and I'm running out!</div><div><br></div><div>I've a whole list of likely causes to my dilemma, some of which I can't do anything about (like the cataract in one eye) and other things like 3 weeks before the preheat hotplate arrives! and I also didn't add a solder mask when I ordered the PCBs (hence my questions of a 2/3 of weeks ago about PCB manufacture).</div><div><br></div><div>On another note, any recommendations on supplies of solder paste (preferably type 4 or 5) and gel flux. Most sellers on Aliexpress for solder paste seem to be obsessed with the melting temperature with no information about ball size, leaded etc. Looking at Digikey, I'm sure they have what I want if only I knew what I was trying to buy.<br></div><div><br></div><div>Cheers<br></div><div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr">Robin Gilks<div><br></div></div></div></div></div>
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